Organized by the Cornell Lab of Ornithology and by Birds Canada, volunteers for Project NestWatch observe local nesting birds and track whether they’re successful in raising their young. Because the nest-watching volunteers monitor birds over a huge area, they cover way more ground than a small team of scientists ever could. Data from Project NestWatch helped scientists reveal that cold snaps and heat waves make many bird parents less successful in raising their young.

More info and transcript at BirdNote.org.

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